SECTION 1
CESSNA
GENERAL
MODEL 172RG
SYMBOLS, ABBREVIATIONS AND
TERMINOLOGY
GENERAL AIRSPEED TERMINOLOGY AND SYMBOLS
KCAS
Knots Calibrated Airspeed is indicated airspeed corrected
for position and instrument error and expressed in knots.
Knots calibrated airspeed is equal to KTAS in standard
atmosphere at sea level.
KIAS
Knots Indicated Airspeed is the speed shown on the
airspeed indicator and expressed in knots.
KTAS
Knots True Airspeed is the airspeed expressed in knots
relative to undisturbed air which is KCAS corrected for
altitude and temperature.
V
A
Maneuvering Speed is the maximum speed at which you
may use abrupt control travel.
V
FE
Maximum Flap Extended Speed is the highest speed
permissible with wing flaps in a prescribed extended
position.
V
LE
Maximum Landing Gear Extended Speed is the maximum
speed at which an airplane can be safely flown with the
landing gear extended.
V
LO
Maximum Landing Gear Operating Speed is the maximum
speed at which the landing gear can be safely extended or
retracted.
V
NO
Maximum Structural Cruising Speed is the speed that
should not be exceeded except in smooth air, then only with
caution.
V
NE
Never Exceed Speed is the speed limit that may not be
exceeded at any time.
V
S
Stalling Speed or the minimum steady flight speed at
which the airplane is controllable.
V
So
Stalling Speed or the minimum steady flight speed at
o
which the airplane is controllable in the landing configu-
ration at the most forward center of gravity.
CESSNA
SECTION 1
MODEL 172RG
GENERAL
V
x
Best Angle-of-Climb Speed is the speed which results in
the greatest gain of altitude in a given horizontal distance.
V
y
Best Rate-of-Climb Speed is the speed which results in the
greatest gain in altitude in a given time.
METEOROLOGICAL TERMINOLOGY
OAT
Outside Air Temperature is the free air static temperature.
It is expressed in either degrees Celsius or degrees Fah-
renheit.
Standard
Standard Temperature is 15°C at sea level pressure alti-
Tempera-
ture
tude and decreases by 2°C for each 1000 feet of altitude.
Pressure
Pressure Altitude is the altitude read from an altimeter
Altitude
when the altimeter's barometric scale has been set to 29.92
inches of mercury (1013
mb).
ENGINE POWER TERMINOLOGY
BHP
Brake Horsepower is the power developed by the engine.
RPM
Revolutions Per Minute is engine speed.
MP
Manifold Pressure is a pressure measured in the engine's
induction system and is expressed in inches of mercury
(
Hg
)
.
AIRPLANE PERFORMANCE AND FLIGHT PLANNING
TERMINOLOGY
Demon-
Demonstrated Crosswind Velocity is the velocity of the
strated
crosswind component for which adequate control of the
Crosswind
airplane during takeoff and landing was actually demon-
Velocity
strated during certification tests. The value shown is not
considered to be limiting.
Usable Fuel
Usable Fuel is the fuel available for flight planning.
Unusable
Unusable Fuel is the quantity of fuel that can not be safely
Fuel
used in flight.
GPH
Gallons Per Hour is the amount of fuel (in gallons)
consumed per hour.
1 July 1979
1-7
1-6
1 July 1979
